package com.gitee.zzh.demo.service.impl;

import com.gitee.zzh.common.ImageUtils;
import com.gitee.zzh.demo.service.QRCodeWithPictureService;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Set;

public class QRCodeWithPictureServiceImpl implements QRCodeWithPictureService {

	private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸  
    private final int QRCODE_SIZE = 500;
    // LOGO宽度  
    private static final int WIDTH = 60;
    // LOGO高度  
    private static final int HEIGHT = 60;

    private BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        hints.put(EncodeHintType.QR_VERSION, 10);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int minWidth = ImageUtils.getMinWidth(bitMatrix);
        Set<String> set = ImageUtils.getStartIndexSet(bitMatrix, minWidth);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (String s : set) {
            int x = Integer.parseInt(s.substring(0, s.indexOf(",")));
            int y = Integer.parseInt(s.substring(s.indexOf(",") + 1));
            int rgb = ImageUtils.getDarkColor().getRGB();
            for (int xx = x; xx < x + minWidth; xx++) {
                for (int yy = y; yy < y + minWidth; yy++) {
                    image.setRGB(xx, yy, rgb);
                }
            }
        }
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (!bitMatrix.get(x, y)) {
                    image.setRGB(x, y, 0xFFFFFFFF);
                }
            }
        }
        if (imgPath == null || imgPath.isEmpty()) {
            return image;
        }
        // 插入图片  
        this.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 插入LOGO
     * @param source 维码图片
     * @param imgPath LOGO图片地址
     * @param needCompress 是否压缩
     */
    private void insertImage(BufferedImage source, String imgPath,
            boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println(imgPath+"   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO  
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height,
                    Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图  
            g.dispose();
            src = image;
        }
        // 插入LOGO  
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 生成二维码(内嵌LOGO)
     * @param content 内容
     * @param imgPath LOGO地址
     * @param path 文件路径
     * @param needCompress 是否压缩LOGO
     */
    @Override
    public void encode(String content, String imgPath, String path, boolean needCompress) {
        BufferedImage image = null;
        try {
            image = this.createImage(content, imgPath, needCompress);
            OutputStream outputStream = new FileOutputStream(path);
            ImageIO.write(image, FORMAT_NAME, outputStream);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}  
